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標題: | 臺灣產豬母乳之榕小蜂打鬥傷害 Fighting Injuries of Fig Wasps (Hymenoptera: Chalcidoidea: Sycoryctinae) associated with Ficus benguetensis in Taiwan |
作者: | Da-Mien Wong 王達勉 |
指導教授: | 周蓮香(Lien-Siang Chou) |
關鍵字: | 豬母乳,榕小蜂,打鬥傷害,雄蟲出果,體型大小, Ficus benguetensis,fig wasps,fighting injuries,male emergence,body size, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | Fighting to the death over limited resources is an extreme behaviour in nature. In general, animals do not engage in all-out fights to the limit of their abilities. However, lethal fighting is a common component of mate competition between males of some species of fig-associated wasps. I investigated fighting injuries in three species of fig wasps which are found in the syconia of Ficus benguetensis. It is notable that no Ceratosolen wui males were known to engage in fighting. In contrast, fighting amongst Philotrypesis and Sycoscapter males could lead to serious injuries such as laceration, amputation and decapitation. The male biased syconium sex ratio (SSR) in Philotrypesis and Sycoscapter may have been conducive to extreme fighting. Surprisingly, all three species of males wasps emerged from their natal syconia, which opposes the general assumption that wingless male fig wasps do not disperse. This evidenced male emergence may be followed by a reduction in aggression.
Fig wasps display a wide range of variation in their morphologies and mating strategies. The variation can be so extreme that conspecific winged and wingless males have sometimes been mistaken for different species or even genera. In my study, the mandible lengths of Philotrypesis showed a positive relationship with head width and were continuously distributed. However, the mandible lengths of Sycoscapter showed a positive but discontinuous relationship with head width, indicating that the morph consisted of two types of individuals. As opposed to the prediction, no clear pattern could be found between the body size and risk of injury in Philotrypesis and Sycoscapeter. Small males did not seem to suffer more severe injuries, so there was no advantage to being large during their mortal combat. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/59017 |
全文授權: | 有償授權 |
顯示於系所單位: | 生態學與演化生物學研究所 |
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